Computer Interfacing

Introduction

tify

and

access

the

required area

of

memory

at any in-

stant,

the

Data

Bus

that

is

used

to

transfer data back

and forth between processor, memory

and

peripherals,

and

the

Control

Bus

whose functions include

co-

ordination

of all the

events during

the

running

of a

com-

puter program.

It would

be

useful

to

define,

in a

general

way, the

func-

tion

of any

interface device.

It is not

unreasonable

to

ask

why

such

a

device

is

needed

at all. To the

initiated

it

may seem obvious; those with less experience

of the

ways

in which computers

and

peripherals work

may not

find

it

so

apparent.

Signal conversion

The need

for an

interface arises eithe ...